Factoring using GCF
So this Section is "solving quadratic equations by factoring", I got the hang of it, but stumped on a few. So one problem says 8y^2 -28y-60 and the answer is 4(2y+3)(y-5). I do not get how they got that though. Because for other problems like 5x^2+5x-10 I came up with 5(1x^2+1x-2) and it seems legit (Did it according to how a site taught iT)
Also troubled on 3x^2+54x+243. The GCF is 3, so I do 3(1x^2+18x+81). Either thats it or I break it down to 3(1x+2x)(1x+9).